The author of the passage makes which of the following claims about the eight extant Latin tragedies? A. There is only circumstantial evidence that the plays were all written by the same author. B. Scholars have persistently attributed the plays to Seneca despite evidence that some of them may have been composed prior to his lifetime. C. Evidence in the manuscripts of the plays identifies them as having been written by Lucius Annaeus Seneca the Younger. D. The plays contain some lines that have been construed as being directed against the emperor. E. The plays contain material that could illustrate certain aspects of Seneca's philosophy.